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[SEAOC] Re: Seismic Design versus Wind Design in Wood[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Re: Seismic Design versus Wind Design in Wood
- From: GCHOCK(--nospam--at)aol.com
- Date: Tue, 9 Jul 1996 15:37:50 -0400
What follows is an expression of opinion elicited from recent listings indicating some displeasure with wind design speeds and exposures. Please feel free to ignore if this is not of interest to you. I think that it may be beneficial for engineers to maintain an objective viewpoint towards seismic and wind design requirements for wood frame construction. Using seismic design forces as a judgemental yardstick as to whether the wind criteria is "reasonable" or "overly conservative" would not appear to be justified from an understanding of how these forces are generated. One should also bear in mind that the 50-year recurrence interval wind forces are not reduced, unlike the 475-year recurrence interval seismic design forces, and so they reflect vastly different performance objectives. Taking a broader(i.e., for this discussion including more than just California) perspective of the experience of wood frame construction in natural disasters, hurricane and high winds have caused more frequent, widespread and greater catastrophic damage than earthquakes. Proper seismic design does not assure an adequate wind design. A viewpoint from a structural engineer practicing in a state with 80 mph basic windspeed and typically exposures C and D(hardly any B), and seismic zones 1 through 4. Gary Chock, S.E. Member, SEAOH and SEAONC ...
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